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It uses standard .277″ diameter projectiles, although it is limited in its selection of those by the overall length.
That round is the 6.8mm Remington Special Purpose Cartridge.
It is very curious to me that a round that was designed with an accurized designated marksman’s rifle in mind also features such a short ogive and low muzzle velocity.
Typically, medium/long range precision weapons platforms place a premium on both the ballistic coefficient and velocity of the projectile, seeking to obtain as laser-like a trajectory and as high a retention of energy as possible. The ogive of a bullet is the curved portion of the projectile that is exposed outside the case.
Auto CAD drawings of the prototype calibers in the same cartridge case were prepared by Cris Murray of the US Army Marksmanship Unit.
Remington went to work to standardize the angle of the shoulder and length of the neck.